Two worlds collide to the death when an NYPD officer and career criminal meet in Brooklyn Alley.

A budding NYPD officer and a career criminal accused of his murder follow two very different paths to their first, last and fateful meeting.

Police officer Adid Fayaz, 26, a father of two young boys, was about to buy a used car advertised online when he arrived in Brooklyn with his son-in-law on the night of Feb. 3. They were met. Randy “Popper” Jones, a former inmate with 13 previous arrests in New York and a hidden gun, police said.

Guys, do you have weapons? Jones asked before headlocking the unsuspecting cop and drawing his weapon to launch a lethal attack. Fayaz was shot in the head right after he broke free.

His brother-in-law drew the mortally wounded policeman’s pistol from his hip holster and returned fire, while Jones returned fire in a quick and furious firefight that fired 11 shots. The suspect, wearing a black jacket and gray sweatpants, fled in his mother’s black BMW and left Fayaz lying in a dark alley.

The young officer was pronounced dead Tuesday at Brookdale University Hospital after a three-day vigil of devastated family, friends and fellow officers gathered in support. Jones had been arrested a day earlier for a deliberate robbery that turned into a fatal shooting, and he soon became the exact opposite of his victim.

Fayaz was a five-year veteran of the NYPD, a religious man and an active member of the Society of Muslim Officers. He commuted to Precinct 66 in Brooklyn from his vacation home in Deer Park, Louisiana, and joined the division in 2017, following the path of two police uncles.

“He loved this city,” said one of them, Mehran Fayaz, at his nephew’s funeral.

Born in Pakistan, Adid Fayaz came to the US as a 5-year-old boy and announced his aspirations to become a police officer while still a high school student. He was fluent in five languages, recalled NYPD Commissioner Keechant Sewell.

And there was Jones, with a string of previous arrests dating back to 2008, when his shooting victim was just 12 years old. He was the father of five children, including a six-month-old baby. The infant, along with his siblings and mother, watched as police arrested a bearded suspect at a Rockland County hotel last Monday.

Police said Jones arrived at the fatal encounter with Fayaz driving his mother’s black BMW, later abandoned in Harlem, before he headed north to hide. Prosecutors later testified that the suspect had sealed the bullet hole in the car with a piece of tape in an unsuccessful attempt to avoid detection and arrest.

Jones, 38, was behind bars when Fayaz’s family and fellow officers gathered again Thursday at a Coney Island mosque for a final farewell. His widow Mahida Sabil and their sons Ryan, 4, and Zayan, 3, joined hundreds of NYPD officers on duty two days after their patriarch was taken off life support.

On Wednesday, Jones was held without bail for a trial in Brooklyn, where he arrived in a white Tyvek jumpsuit. More than 100 NYPD officers appeared to be glaring at the defendant in Brooklyn Criminal Court, with Jones not saying a word during his appearance.

Assistant District Attorney Leila Rosini noted during the hearing that Fayaz was trying to buy a much less flashy car than the BMW the defendant was driving on the night of the shooting.

“A car that attracts hardworking and honest people,” she said.

The officer’s planned purchase of the $24,000 Honda Pilot almost did not materialize: Fayaz canceled the first meeting due to ill health, but the purchase was rescheduled for February 4th.

Authorities later said the murder suspect’s criminal record dates back to 20 years, including arrests for strangulation, armed robbery, aggravated harassment, and “sexual intercourse” with an underage teenage victim in Virginia.

Fayaz looked to the future before he was killed. The officer studied with one of his NYPD uncles to pass the sergeant’s exam, and friends teased Mehran Fayez that his nephew would get promoted first.

“He so wanted to join the police, he passed the tests so early,” said his uncle.

When the police took Jones into custody, the arresting officers made sure to handcuff the murdered officer to the man accused of murder.

“We wanted him to know what he did to this officer,” said NYPD Chief of Detectives James Essig. “And he was handcuffed by this officer. I think it sends a powerful signal.

Retired NYPD officer Ahmen Nasser, who befriended Fayaz through the Society of Muslim Officers, delivered a powerful message to the murder suspect while on duty with other officers outside the hospital.

“I hope you rot in hell,” Nasser, 57, said.